The SAP web service should provide a WSDL file. Using that file, you can use the "Add Service Reference" option (Project->Add Service Reference) to create a proxy class that will interact with your service.

Thanks for the info but I have that part completed up to this point.
The Web Reference is named - Product_Details but I don't know how to interact with that.
I need to input the Plant and Order Number and retrieve the returned details that come from different tables within the web service. How do I make the call in C# application?

You should have specified a namespace for the generated classes. Under that namespace there will be a class whose name ends with "Client". That is the proxy class you will use to interact with your service**. It will have methods that correspond to each function exposed by your service. Everything else should be classes that correspond to the parameters and returns from your service's functions. Just create an instance of that Client class, and instantiate any parameters its particular methods take, and you should be able to call the service.

** There could be more than one of these classes; it just depends on how your service was set up.

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